Variable condenser



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J. A. GARCIA VARIABLE CONDENSER Filed Jan. 5, 1926 2/ f, g2 Il I Z 5 f 3 IN VEN TOR.

ATTORNEYS Patented ,Jano 10, 1928.

JOS ANCIRA. GARCIA, OF SWTELLE, CALIE'QRNM vamente conan-nenn,

Application led January 5, 1926. Serial No. 79,378.

My invention relates to variable condensers as used in radio receiving and transmitting apparatus, as well as in telephone and telegraph apparatus.

In variable condensers as heretofore proposed, they are constructed of a set of stationary plates constituting a stator, and a set of movable plates constituting a rotor which are movable into and out of the stator lo plates to vary the' capacity of the condenser.

I have found that such late condensers When used in radio receviing sets produce objectionable noises and other troublesvvhich seriously interfere With perfect reception.

It is a pu ose oi my invention to provide a varialiid condenser which by the use of tubular stator and movable elements coinpletel eliminates the use oi plates and the atten ant disadvantages, thus greatly fur- 20 thering perfect reception in radio apparatus I will describe only one form o variable condenser embodying my invention and will then point out the novel features thereof in claims,

In the accompanying drawings,

Figure l is a vievv showing in front ele vation one form ofi variable condenser em bodyingany invention;

Figures 2 and 3 are sectional views taken 3@ on the Lines 2 2 and 3-53, respectively, ot

Figure 1,

Rete specically to the drawing, in which sim' ar reference characters refer to similar parte, my invention, in its present 3o embodiment, comprises a plate 15 oi snitable insulating material boite or otherwise secured to the inner side of a panel 16 consti tating part of a suitable cabinet. Secured to the longitudinal edges of the plate are a de pair of guiding sleeves 17 which are ci angular shape in cross section to slidably receive correspondingly shaped rods 18. @ne

end et the rods i@ is connected by a bar 19 of insulating material, and secured to the outer side of this bar is an angle bar 20 formed of conducting material and i rovided at intervals with openings throng" which are extended the threaded ends on? conduct-` ing elements 21 constituting the rotor oi E@ the condenser. ,'llhese threaded ends are en= gag-ed by nuts 22 at opposite sides oli the vSoar 20 and so as to drm y embrace the bar nd thereby secure the elements 2l to the te A second angle 2t ci? conducting maa terial is secured to one end of the sleeve 17, and this bar is likewise provided at intervals with openings to receive the threaded ends of con ucting elements 24 constituting the stator of the condenser. Nuts 25 engage the threaded' ends of the elements at op osite sides of the angle bar 23 so as to rmly secure the elements to the bar in the same manner as described in connection with the elements 21.

The elements 21 and 24; are of tubular form, as clearly shown in Figure 3, and of such diameter that the elements 2l are telescopically received Within the elements 24. Spacing sleeves 26 (Figure 3) formed of insulating material are secured to the inner ends of the elements 2l and these sleeves are adapted to have sliding engagement with the elements 2li to support the elements 21 in spaced relation to the elements 24, irrespective of the longitudinal adjustment of the former within the latter.

The rods 18, being slidable in the sleeve 17, operate to support the movable elements 21 for movement longitudinally into and out of the stator elements 2d, and with the movable elements maintained in spaced relation to the stator elements through the medium of the insulating sleeves 26, it 'will be manifest that the intervening space provides the di- ,electric 'which is capable of being increased or decreased in accordance with the longitudinal adjustment of the movable .elements vvitli respect to the stator elements. Any longitudinal adjustment of the movable elements can he edected by forming one of the rods 18 with teeth 27 to provide a rack bar engaged by a pinion 28 lined to a stub shaft 29 journaled in the panel 16 and provided vvith an operating'handle 30. By rotation ci the handle 30, the pinion is actuated to move the rack bar longitudinally and with it the several movable elements, so as to vary their longitudinal adjustment with respect to the stator elements.

Binding posts 31 and 32 angle bars 20 and 23, and it will he under stood that conductors (not shown) are con-= nested with these binding posts for supply-s ing the current to the movable and stator elements.

Although l' have herein shown and de-= scribed only one form ci? variable condenser embodying my invention, it is to be under= stood that various changes and modidcetions il@ dit@ are carried by the may be made therein without de arting from the spirit of the invention and t e spirit and scope of the appended claims.

l claim as my invention:

1. A variable condenser comprising a support, guiding sleeves secured to the support, tubular movable elements, a frame for supporting the movable elements in fixed position relatively and including rods slidable in said sleeves, stator elements of 'tubular form secured on the support and telescopically receiving the movable elements, and means b which said frame is moved to varjy7 the longltvdinal position of the movable elements w ith respect to the stator elements.

2. A variable condenser comprising a support, uidng sleeves secured to the sup ort and o? angular 'form in cross section, ro s of angular form in cross section and slidably received in said sleeves, an insulating bar connecting the sleeves, an angle bar secured to the insulating bar and provided with openings' tubular movable elements secured Within t e openings of said bar, a second angle bar secured to the sleeves and provided with openings, tubular stator elements extending into and secured within said openings to concentricalljy receive the movable elements, spacing sleeves secured to the rotor elements to maintain the saine in denite spaced relation to the stator elements, a rack formed on one of said rods, and a pinion engaging the rack for the purpose described.

3. A variable condenser comprising a support, guiding sleeves secured to the support, rodslslidably received in said sleeves, a bar connecting the rods and insulated therefrom, movable elements secured to said bar in spaced parallel relation, a second bar eecured to the sleeves, tubular stator elements secured 'to the second bar in para-llelrelation to and freely receiving the movable elements,

means slidably received in the stator elements for maintaining the elements in donite spaced relation, and means for actuating the movable elements to vary tile telescopic relation thereof with respect 'to the stator elements.

JS MCM GRCL., 

